Jason was formerly the Roman pottery specialist for the York Archaeological Trust and became Director of Guernsey Museums. Currently he combines archaeology with thriller and crime writing and has published widely. For some years he and a team have been investigating a small Roman fort at a site known as the Nunnery. With a central tower, the outer walls resemble those of the so-called signal stations of the north Yorkshire coast. In later times it was used by the German military in the occupation of the Channel Islands.